[Solved] New System ($650 budget)

Heya folks,

My friend wants me to build him a new system for "about $650." I asked him what he wanted, and here's what he said:
"A decent graphics card with 1 GB of memory, a 3.0 GHz quad core, 8 GB of RAM." He didn't have any other specifics in mind. He's by no means a power user at all. I think the most graphics intensive think he does is play World of Warcraft. Otherwise, he just surfs the net and uses typical Office-like programs. (No idea why he wants 8 GB of RAM.)

I've worked in computer shops before fixing old computers, but I've never spent much time with new computers, so I have no idea about the latest and greatest hardware. Here's what I was thinking, just based on browsing Newegg.com and Drectron.com. I'd appreciate any feedback.

AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 95W Quad-Core Processor Model HDX945WFGIBOX ($165)

GIGABYTE GA-MA770T-UD3P AM3 AMD 770 ATX AMD Motherboard ($80)

WD Caviar Black WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive ($75)

HIS H467QS1GH Radeon HD 4670 1GB 128-bit DDR3 PCI Express 2.0 x16 HDCP Ready Video Card ($75)

Crucial 2GB DDR3 1066 (PC3-8500) System Memory, 240-pin DIMM, Unbuffered x4 ($156)

Black Broadway Com Corp 9257-Black Steel ATX Mid Tower Computer Case, w/ 600W Power Supply and 250mm Fan ($53).

That all leaves me at $604, which means I have a little room to bump up the quality of one thing or another if it seems important.

Thanks a bunch for any suggestions!